The Chancellor of the Exchequer in 2001, Gordon Brown, changed the law due to concerns that revenue was being lost to overseas gambling websites. Prior to that, tax had been applied to all winnings, with the rate being set at nine percent in the latter days of the tax. No one has to pay tax on any of the winnings that they acquire from betting in the UK since the law changed in 2001.
ARE UK GAMBLING WINNINGS SUBJECT TO TAX IN THE UK?